Ko Lap Yan is a compassionate and experienced psychiatrist who specializes in schizophrenia and even minor mental illnesses. Mok Man Yee is an inspector of the Serious Crime Unit who is diagnosed with genetic mental disease. This drama explores different types of mental diseases. Mok's superior always pick on her and in order to prove her capability as an inspector to her superior she tries to solve cases on her own.

Mok Man Yee after her encounter with Ko Lap Yan, she teams up with him and manages to solve her case. After that, she realises that Ko's insights on criminal behaviour is very helpful in helping her solve cases and thus, she continues to consult him every time she lands on a case. In the course of solving cases, Mok and Ko also develops feelings for each other.